Depending on which group you were in, this was either a stroke or freestyle set. Not quite overdistance if you chose freestyle, but definately overdistance if you’re a stroke swimmer.
6 x 400 long course
Interval on #1 was 6:30
Intervals on #2-3 were 6:00
Intervals on #4-6 were 5:45
If you were going stroke, and were unable to make the entire swim within the time allowed, you could switch to a 350.